<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <input
          ref="uploadRef"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="onUploadFile"
        >
        <!-- // 2.监听input的chang事件 -->
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="getTemplate">下载导入模板</el-button>

          <span>将文件拖到此处或
            <el-button type="text" @click="onUpload">点击上传</el-button>

          </span>

        </div>

      </div>

    </el-row>

    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>

    </el-row>

  </el-dialog>

</template>

<script>
import { getExportTemplateAPI, uploadExcelAPI } from '@/api/employee'
import { saveAs } from 'file-saver'
// 1.封装上传文件的接口
// 2.监听input的chang事件
// 3.通过e.target去找文件
// 4.FormData把文件追加到FormData对象中
// 5.调用接口
// 6.修复小问题
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    async getTemplate() {
      const res = await getExportTemplateAPI()
      saveAs(res, '员工导入模板.xlsx')
    },
    onUpload() {
      this.$refs.uploadRef.click()
    },
    async onUploadFile(e) {
      // 3.通过e.target去找文件
      // 4.FormData把文件追加到FormData对象中
      // 5.调用接口
      // 6.修复小问题
      try {
        // 3. 通过e.target.files去找文件

        const files = e.target.files
        if (files.length === 0) return

        // 4. FormData 把文件追加到FormData对象中
        const data = new FormData()
        data.append('file', files[0])
        // 5. 调用接口

        await uploadExcelAPI(data)
        this.$emit('update:showExcelDialog', false)
        this.$message.success('导入成功')
      } catch (error) {
        console.log('  ----->  ', error)
      } finally {
        // 6. 修复小问题,修复同名文件多次上传无响应问题，因为用的是change事件，所以需要手动清空发生变化才能继续上传
        this.$refs.uploadRef.value = ''
      }
    }

  }
}
</script>

    <style scoped lang="scss">
    .upload-excel {
    display: flex;
    justify-content: center;
    margin: 20px;
    width: 360px;
    height: 180px;
    align-items: center;
    color: #697086;
    .excel-upload-input {
      display: none;
      z-index: -9999;
    }
    .btn-upload,
      .drop {
      border: 1px dashed #dcdfe6;
      width: 100%;
      height: 100%;
      text-align: center;
      line-height: 160px;
      border-radius: 8px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .drop {
      line-height: 40px;
      color: #bbb;
      i {
        font-size: 60px;
        display: block;
        color: #c0c4cc;
      }
    }
  }
</style>
